.NET Framework tips

This is a simple thing I seen written somewhere once but never had to use.

If I'm adding the following to the top of all my page
 
Imports System.IO

There is somewhere I can add a bit of code that would include them all in one place so I wouldn't need to add them all in one place but I don't remember where that place is.

Slightly confused by the fact my site is an ASP.Net AJAX site so I'm not used to the differences in the web.config file.

Anyway is there somewhere I can add "Imports System.IO" that would mean adding it to each page would be unnecessary? 

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